Results 51 to 60 of about 67,575 (97)

Advancing CO2++ Modeling in the Martian Dayside Ionosphere: Insights from Natural Lifetime Analysis

open access: yesThe Astrophysical Journal
The molecular dication CO _2 ^++ has, as previously reported, been detected in the Martian ionosphere by the Neutral Gas and Ion Mass Spectrometer on the Mars Atmosphere and Volatile Evolution (MAVEN) mission.
Long Cheng   +4 more
doaj   +1 more source

Local 2D Simulations of the Ignition of a Helium Shell Detonation on a White Dwarf by an Impacting Stream

open access: yesThe Astrophysical Journal
The double detonation model is one of the prevalent explosion mechanisms of Type Ia supernovae (SNe Ia) wherein an outer helium shell detonation triggers a core detonation in the white dwarf (WD).
Nethra Rajavel   +2 more
doaj   +1 more source

Evolution of Magnetic Reconnection in an Electron-scale Current Sheet

open access: yesThe Astrophysical Journal
Recently, a new type of magnetic reconnection, electron-only reconnection—where there is no obvious ion flow and heating—has been observed in various plasma environments.
Yundan Guan   +3 more
doaj   +1 more source

Most Super-Earths Have Less Than 3% Water

open access: yesThe Astrophysical Journal
Super-Earths are highly irradiated, small planets with bulk densities approximately consistent with Earth. We construct combined interior atmosphere models of super-Earths that trace the partitioning of water throughout a planet, including an iron-rich ...
James G. Rogers   +4 more
doaj   +1 more source

Global and Local Infall in the ASHES Sample (GLASHES). I. Pilot Study in G337.541

open access: yesThe Astrophysical Journal
Recent high-angular-resolution observations indicate the need for core growth to form high-mass stars. To understand the gas dynamics at the core scale in the very early evolutionary stages before being severely affected by feedback, we have conducted ...
Kaho Morii   +6 more
doaj   +1 more source

A Deficit of Massive White Dwarfs in Gaia Astrometric Binaries

open access: yesThe Astrophysical Journal Letters
The third data release of Gaia introduced a large catalog of astrometric binaries, out of which about 3200 are likely main-sequence stars with a white dwarf (WD) companion.
Na’ama Hallakoun   +4 more
doaj   +1 more source

Dynamics of Binary Planets within Star Clusters

open access: yesThe Astrophysical Journal Letters
We develop analytical tools and perform three-body simulations to investigate the orbital evolution and dynamical stability of binary planets within star clusters.
Yukun Huang, Wei Zhu, Eiichiro Kokubo
doaj   +1 more source

Grapevine pangenome facilitates trait genetics and genomic breeding

open access: yesNature Genetics
Grapevine breeding is hindered by a limited understanding of the genetic basis of complex agronomic traits. This study constructs a graph-based pangenome reference (Grapepan v.1.0) from 18 newly generated phased telomere-to-telomere assemblies and 11 ...
Zhongjie Liu   +40 more
semanticscholar   +1 more source

Comparison between the Emission Torus and the Measured Toroidal Magnetic Field for the Crab and Vela Nebulae

open access: yesThe Astrophysical Journal
Polarization measurements provide insight into the magnetic field, a critical aspect of the dynamics and emission properties around the compact object.
Wei Deng   +7 more
doaj   +1 more source

An Intermediate-mass Black Hole Hidden behind Thick Obscuration

open access: yesThe Astrophysical Journal
Recent models suggest approximately half of all accreting supermassive black holes (SMBHs; M _BH ≳ 10 ^5 M _⊙ ) are expected to undergo intense growth phases behind Compton-thick ( N _H > 1.5 × 10 ^24 cm ^−2 ) veils of obscuring gas.
Peter G. Boorman   +14 more
doaj   +1 more source

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